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The asymmetric unit of the title compound, C18H20N2O4, contains one-half mol­ecule with an inversion center located at the centroid of the mol­ecule. In the crystal, mol­ecules are linked by C—H⋯π inter­actions, forming layers parallel to (101). An intra­molecular O—H⋯N hydrogen bond also occurs.

Key indicators: single-crystal X-ray study; T = 295 K; mean (C-C) = 0.003 Å; R factor = 0.031; wR factor = 0.081; data-to-parameter ratio = 15.2.The title molecule, C 16 H 12 Cl 4 N 2 O 2 , lies about an inversion center. The symmetry-unique part of the molecule contains an intramolecular O-HÁ Á ÁN hydrogen bond. In the crystal, molecules are arranged in corrugated layers parallel to (101). Weak -stacking interactions, with a centroid-centroid diatance of 3.7923 (13) Å , are present. Related literature

In the title Schiff base, C29H26N2O4, the complete molecule is generated by a crystallographic twofold axis and is V-shaped. The planes of the benzene rings of the central diphenyl­methane unit make a dihedral angle of 78.11 (4)° while adjacent benzene and 5-meth­oxy­salicyl­idene rings are twisted with respect to each other by a dihedral angle of 11.84 (8)°. The Schiff base is in the enol–imino form and an intra­molecular O—H⋯N hydrogen bond is observed.